Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96f42520527389627f340d654f92623713759f8f7d22765629b7a5cf068ee5e' 
  AND token = 'e3XemTs1oPwqw93msgngnbsq0MFRcuqjtLyUPu8gIMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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