Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b6b92c75a41664731b6be7e6dae73a87136a8dc467bb1dd6ba5bddda1abfe6' 
  AND token = 'UTTUegc2H6z7WSDO2p24qm7zArG+cY2sOqXmXZ0prUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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