Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '043afdc9c9c1961f8f079f8fcf191c21497014971031533b78a740c218a2ed40' 
  AND token = 'YqVvF6XqaUzDeq11pOv2sslU4EAGmpft8BMobeUYxcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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