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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3083b0db54e9e6c6a0fe5740e3b207c3e223584c76f95f07775a312184dc5aeb' 
  AND token = 'k9T0lZM97ZRkvwxbqbZBzLsJw3c8zQbbVBSsRcf7+FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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