Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec1368bf31f5d7a0ef623a65604322990f35aeec192af390690cd3dc0591f657' 
  AND token = '5DHsMugo4K4ainnswPOPw90M9ckFOyVuG560RRgs9bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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