Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a6666051168286cf8847ee0c6c0f0d3a0fcd8e313858e245f8411c7bb92b167' 
  AND token = 'G5vsRE+cPvXEpiEMradxm5bxXFkV+nKQ0xRGuv0xvbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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