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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0d22268c87a731ad540f38e2533292146107dd81174de7ba48bf4ba3b8c5c24d' 
  AND token = 'WtolfUH5prgWGJx4mL2IIQLEmmXScrwrfRQ4e2yyLJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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