Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b06e370ca00446b5b5644d5ea0778ba64a0ce688e2df890ce4b8990addb380' 
  AND token = 'RzHNVfGeRI7MRs7MhPx8WtSkrDsBBtEH/xtshQRUULA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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