Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac8e0c1cd3685af814adaf3c3c801f7d5e4cf35ebb35182b3b8b6f8e9348f48' 
  AND token = '6HS84BnC3feADj4LpBGg0lgEgDVJ9pSbFuKnFuf2Zt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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