Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f0a783d69de1f6d1db8622fec0b9d89978f7d7f4fb0b30625912e75afb163a' 
  AND token = 'SSoGp5ZNYkBbTynQRHRlGPPrMR1K//nZmofN9BzWqSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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