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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a9cad8a2d327477c6640ac7f30f4f59fabce32199fe841a60ffaa3010d67048e' 
  AND token = 'ox+T+YLjTSg43zP+DAd3w1fMphSn4TOIxD2YT9KAhoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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