Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e8e3b815d248998c642dae69f79a1d821e40e725f88bfce794e687681b209e4' 
  AND token = '3RomYCU4pGRDFeI14ctMgDQRc5FH58zillkuBw4Xxxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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