Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a7182aec956b304dc20a177076505e14ab6bde26a10cd878c82a9169974dc4' 
  AND token = '2SVUlRjm6zFvNpjPzEwkLPrS7p5G3e1zKcI1zUWQzkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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