Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7611eb1f5cde9e74e7831024aae54dc24f9daab4e4fbce4cd0296c1b62b0e39' 
  AND token = '1n52723S+ybG1XQl2o7hAIPE2tnFHGJzUxV8L0C6mBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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