Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e535f84467b8a7a59eccc5b1585dab1a0285ac12acfaefaa2de4265e454316' 
  AND token = 'Rmh/FSYdWUpZUzm4q4u6kwxHueUdjh4zGEKFVIEW/ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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