Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f37f4593257bd16ce28555441873627ac0df0465e056bdc5a4ca29b5c3f82ef7' 
  AND token = 'Uzg2kJpUCIuxCdzd+0jSI8NdgeT52RM7Qq3YiT5Qy9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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