Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '424f66e9848428beb523fa882762d610082c26f8ee2aa18c8c35ec48195d34c2' 
  AND token = '0zA9e8bm/FQivjXiynW1Ql8fH+QISlOEzdywvlk+yIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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