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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4ebf14a54a0fba5a4edc9bd9c785630be1f91882631f5b982a82275e6a27e5e7' 
  AND token = 'BrH8ugg36voljKYD0a6erpF7oDjP+y1bNMW2JFjc68o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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