Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a1f7d7c5743f5fd0d10d9b38c247f529204d42ad7e3fef702e717c35057b78' 
  AND token = 'ZGPnyp1s5AOu3ldn2qvS3qHgCvEk7CBJygLVTxAiq3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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