Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889bcf5da61b27a10a903a280bfc700cf943149ae2dec0f631c62db2ea3627d9' 
  AND token = 'MXoRPU3D/Wo3KQByK/M50X4TtK4U3DURUVv/lPFYnwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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