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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6663892b709f4918fd48201909981bea03bb6a4b4dd77d28fbe96019d06178a8' 
  AND token = 'WkuA7Kv2aPKLxrZrYV9YZSAWKVf7WKpqrSeyGGlCyVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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