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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2e7e3c0d817f9c99f4dff613c8d8c6da05e50d0fe90f7e733945e80fe52f4158' 
  AND token = 'DH157F2V12RQXfdfmJ8J5piWX/7JkWdkQBF11vXI028=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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