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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '86e1112e6bdfcc9ced8a3a0efe0bd44ee0ee6734096f06677c5202d865cf1bff' 
  AND token = '3hkUluo2wSd/AiVYkYH9RES5op92x37TR5dNZvZJmLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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