Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c475aa624254e25175a4407f3c4e417130f94f7f14520842bb01fa4de6769f7' 
  AND token = 't/hZK0/twiQ37ztvsOlU0HNZPG2LIpPMtrLBcsqMME8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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