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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5a3da4fd25d49c0186dc17dadea27a0e9b27389933c68ce269e62cc6745dd10b' 
  AND token = '5vtJN92WxhENOXvwGugsrCMVilBOf12N1gwhOpM1ZYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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