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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd7b557d8460770ccfe97a2b3c2a5f1127791d7443fb8eafd5c830073b4c91b68' 
  AND token = 'bd7X/tZVDZAJWoXfrg9jn0W8qg192sro+Jsv0tHENPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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