Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6f6c51bc08a04b4a6b58e60a6c7f1b6688acd4998016f8289c1de2a497a4120' 
  AND token = 'YcC0Bi9OBHb6yZWy6Tyc+ryedmp4VlguUNaKUv12NSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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