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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'eeebde47bcf02df4de75ecce6dbcc46c6d253c6d8209e937147d942c8c6b9f36' 
  AND token = '4vk0kKAUxnHOQvwvJGP4+rgzqQPppI5NlRYJQjEmJPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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