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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '32bca91ce58176557b6adfee74d5d16a308d74cee8df0b16f214c2b18d09ef3e' 
  AND token = 'dcz8ZTKELfMqbg1HJSACBq/0PgG3bbRkp3KQpX9kT/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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