Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ad02397503c413c0b594e6e6c0d15ac95662a8a5de2abe2c1c0f07e9c9ca6d' 
  AND token = '/6TZ0kX/PAN+ng1ueX6LWTeObE0Cdh8gxTIxlaslRSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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