Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce6359f86657146dd4819af8651f17a6a7e9be6d66ae0a7523a75df2f50998e' 
  AND token = 'tcOSbmB678+1aZy9T1Hk6301CR7zcQWWFT31wCqKMrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}