Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393ce1cd973b943308f030f4158842792dc36630d77c47d5a334e2d9028f4463' 
  AND token = '0kOWTQo5lCSGyOoEaPsmbBFuCWCFTmPrXW/d1e45A84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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