Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecebe9f4779b1d3b69b1137c6a3eb86bbfb3cd3f09083012ea8bc52261d9b3d7' 
  AND token = 'dSau3UqY9+Yoe/b0n3p9QD+jWwoPjhwEGUvYeh+7+nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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