Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c376e95744075b5b110b0ad2dce45c24f0e9526eef852ef31f19de74895f57c4' 
  AND token = 'iBbSHpBPmMTyUO41NL/HDdSi2LvbtMcWBVtPJ4G7f0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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