Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abcb23fb0cb46050c2f06449e2c7eba3f7e8259acb38e19f74e1a67c8638df85' 
  AND token = 'mXQ2fqe2GzT1JqWIx+e+Ivmy/X5x3Kn+bxqf8j+PbOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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