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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3010622c690e4392b24b5fa444bbf2015da2f7d38962e1e6072ad789c9ef71b7' 
  AND token = 'tbEtcZ3Qxs7fb1g+zCHEJfkn+LFr5b2CPF/NkrxFQ7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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