Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e5961252f359c7c61c563e4a39fab6a79d44733c6921006a5bae35281ff691' 
  AND token = '0fcRrBHYdVYtF7V/boYUIWIEuYcsCeLkSei7vv2Td68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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