Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39eafb0e3bedb3e62f568f796b4554dff242d01e6a4afdcdade41c075207fbec' 
  AND token = 'DtVMnPTqoM3m1t7y2lEgvyZ2ojlkBxiWR5/9aFqvEUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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