Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18a77fb258fcc5cf4cba7d01ebf5b9d6e6e9b8710692266046619b0c3479812' 
  AND token = 'vdp7bQXpVTxFhRks5fA3pxErLXFuT567sc/Xj7fpgRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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