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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1cb5639d8558ecb08133818c64bd29bb61d5a67a20a5ad07d5b0bc7fa5632423' 
  AND token = 'sciQQDWEXpkBcRhWb3lRC8o76SZz1GvBOxq92Wjot2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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