Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7147a8de5d668c2460ab567aa700316884748c441f2ffa59f9a6e0490cb7f845' 
  AND token = '8trEArmBfOED4BPtL47okQZLQJwNHiH0ThmR38ETgnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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