Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f548866c5812fdf21fe93f1c391015073c080ef6cb94f6d21e731c5bdd02d4cd' 
  AND token = 'MsNIFw2lWUqoxVRg4DrDMfmlMAy7u0ihvniUoPyQBJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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