Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc95250626352b13763c7794feef80cc705441376314b01fbbdd0197417a2d1' 
  AND token = 'OMaFKF55UR3a+/zW/5C2eXaHIezFJDDKbFBknSgsgUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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