Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693a60e2fe237d377c5d2245020842fe9c298c8219b0304d0ad794c6faf3ff84' 
  AND token = 'nLIS06IboGvEtGETZhWAaMK9jv0/92g3fZcbZr+wumU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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