Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5745ce1a1cd2bc71dfd3c7db6245935ac53bd9e7a88e5b7d193926a1cf5610fd' 
  AND token = '2N8/lavXVdDK+9VEGI7A/3MFy9iw48pFv5du8j/52ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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