Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d7dfc16337d0596677a7cab6fa1953badbe870b8d71081e031b6988f33f3693' 
  AND token = 'rRwkUDkvPqUsm60Z5n3hStck3RKwKRod2e9f0DUvYyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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