Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8c1c5cd1eb96ebd10d63ecc01f963b33f27ab27c3fe339aa822b6fb1859f4bc' 
  AND token = 'sfJ8bRof12PUBQPZiGJdfWVYa9f+k8SQydhjDszUjLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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