Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0276ecaadfeed8bbe88f62703effd8ca87989c378a4ef2abe29f87053c551d49' 
  AND token = 'zJB9n/Xhk4zG8YCGCV2Dp/8Z1TMBkSc0CgCk/Q96cxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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