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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2bd6565fa7d70e4f76d7da65146a5fe998eb17d0c8d515e9e5c3b57084fc5de1' 
  AND token = 'thoL+apX+sWz1eSc5sfIb4VjurRFkG+LcoUudZEV80E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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