Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e2eaedf54d98aa6bdc749697bb326eeff55afa0113ddadfadab2b684c17837b' 
  AND token = 'x7qvkwStITK/M06iUTcNmaz5Gxu9I6bwIxF37+j02+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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