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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd6e9bf57fd08c998912c09214e8206dd2ab190421b3cfa4b97768b04e62a2dc2' 
  AND token = 'bM8MEcEo5NU3xV52cOpLW3i68YXwJRHDyWlokpBfDYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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