Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f051c6f2da1ce51fad658d842e3e9d7b5db60d8809f7b4612131966f4a8c18' 
  AND token = 'NXES/ls7h3v6mYioY9L0JcJEFTe0+MNHpO/iosHQkR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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