Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c749e5b344e74b04804ed71e2d5b8657247b504bf97a1123f7bd26c8f8c03637' 
  AND token = 'uCGlBNUGOkrpZg9uBbbeEboubDXktIFuCZ9zME0glf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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