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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '514879cc7cbf3f935075bf75ed7cc0d3ec364dff29ea8eb41055ea054f1ae6ea' 
  AND token = 'Qye2xD6pvVDm7YP3h2FM0z8YSYQYfe7NQcyeJW0pERs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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