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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5726e9335395b25a86ce14c65b6fb6dbd07926f42ce8f308e93979ef733cf689' 
  AND token = 'oQWDUkNq0YJuVTbO0AtwTN4e7Y2EDz6G9UGG9JUSICQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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