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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7a6953606a602ac15aec8cb927dbceab196dfa67ad774aa00941f3ffed7ab7ba' 
  AND token = '9jD5gj6khu/VVgw2Q/ndr5S4Ve67g1Q1K6KEJwIaoxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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