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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'eba246a8de0a68d21c7b60bf581b2bd3470e4e8e39c7f662887ce67c9223b564' 
  AND token = 'V6Yyyam6rDRMlTIBR4tn+tqxLnT40P05mndbX3nYZq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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