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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0712070e4a1894f6900b8b28adf8520da73f5499701b2c5de1f2a14c5698ae32' 
  AND token = '79NbrWNfRtZg55FchK0KgzoM6cfMdttGVdPJXLC6p7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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