SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ac7d35d869b84fb75c9d68dbca638860e6aabcf21061d630da26275cc24dc2b1' 
  AND token = 'UlF4AGF4UYM1u+BUt+qBAOQWe+gVutudQnL9WITFEz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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