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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2026b934522040edc7b67f67046aaa77dd2cb7020a41f1f133a7b79e3246521c' 
  AND token = 'pxM59D2tk0Y029wqHrqkYSix6CnAHhNcJ+eXKh9sT54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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