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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2106021a5cd3e01b255d6c2a84678f4e8ff92cca7db46c2bda03199b1da7c797' 
  AND token = 'My+Ur43p0y91w13juKzBoeEdyx3KJ1WTUWGjjGbGJE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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