Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e7cc306506ce4b165109047272964168c80c6ad9ee0113849fd0bc0ba33700e' 
  AND token = 'ZZqSsPjQN6TaeFwg5Dy6bVG9xnOD+kuNAM8NBp+qkUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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