Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfb138f516c909ed0ac5002a04b037d1a239f55e846d1f82cd19c0cf7ae61da0' 
  AND token = 'rGQOqAKSv4a2xxHbVJP3HIQaW1AP68a4v6tmB6eMXHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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