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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '85edc5e3c71d6cbac0dde9d970ad8d96812b544f725b0339e6ad959c1d583d87' 
  AND token = 'lFo1u6TQ+jqCsblAYlxMaUchT9+ovPp+lwBBYNSxiMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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