Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c7e8a60581113889cadfb38c7e5fd04c0990473f30709a9d27bfb2c05b14a5d' 
  AND token = '3oPe2qNhndtwXNcYYqpWtuas92dCwlSQ9yxMmO4MMA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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