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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '72c4c98286251d0900f1045c753532c300849f6fccac2c4db8feb56fb5df3b07' 
  AND token = 'AfWclipv6MoJPtERyUo5oG7K5DxuVYqxEKJSP7q5HEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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