Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9c66066c36d02df43cb6e60cdde2781acbe1df4b8ae33aa30e561d5aec3582' 
  AND token = 'Wpt731qj7rywbx7dE3+cx+K/lltJ+xRrtGVOThEqIyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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