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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '685c11e3b1621f593b2324c716700b7c35a1e56baab68f87cc730d2aed6c76ce' 
  AND token = 'X7qLEDkgt9Uj9fTV3YUk71j8YtUNLmLi2O9cYPOUR3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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