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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6457be68b46ea25ae5d958ab5ff124a27a327f66ec0ace1655276ca3ffed92da' 
  AND token = 'XmI3n/YAvMyZVoysEPFfpe7Opn1xtFy3yN8kLd3Gwz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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