Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2314172d82784d8483bd6d4c85866d25b9f9192ac0accbd4c67266a6bfb40f' 
  AND token = '/9EiTRqigsIX8BESSI/rcgomQYMCBcp6n3HJlO2+stc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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