Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23270c0b459319522e181282f8661893d09cb291af4f370c1b3109f376de704' 
  AND token = 'r8V5Rc3K0y1/yF0Gsgdqs3h6tF2PVLYv7TkuH/hZGyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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