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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '010736eca4d76be121d3f2cc4ece8b00a9325b568efc63c37ddb391502aa40dd' 
  AND token = 'KTs0R049hW6eCWacFSG8Aoleky7ALezts3HCGD2FbiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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