Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c5ddba7de2583f3a58f031fe88bb26e77484e275acf9c75da9d6e06a46b56a4' 
  AND token = 'l+g/qAu7VrsJD5wDS5MPoZle3QxOpnyeGLV+QZ1kDV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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