Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ab96dd1c4cf5be9d904a001f1aeb1de383ffae6598a78a3810715e6157f558' 
  AND token = 'WhGHuiYjNB25RGvzc0iI/RHzbqaGxhXyp4EHV0Ir2cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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