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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1cf71a8ac6f17a4f7d06036568b01e7e37426ee017dd2e111e8c93c7b2203040' 
  AND token = 'w5dktHZrkkEzptnqmWmXc/4tChBov1FRQCz4x8WvkQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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