Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f459e9139dbf113efd1281f53a740eebdf5a48cf438c18fc8f4e36a530c6f3d0' 
  AND token = 'ROhaWDJKsk3LsYN6ruXdJVgPFT/h0eSatuqEwfSgnwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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