Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3d4de7658a2f5279e642d43b2faed5ee40609bbcc07e5d982d65c0465f4b1a' 
  AND token = '7d9gA7JWzWBem+lsOfO9MyZ+ZARkhe1mi6wG1ZmMgto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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