Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7acf4065100c9d4a031bb27f047d5b7fc312589f3dc75d18b9ded6b72c36aa97' 
  AND token = 'nDLF2ZbLsi4ou2fpdz10LqLgXNS8tXgEGMxJbjyimoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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