Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a2c384df2df6d9b9d8c2a368d11d5f8100f80059bfd27d72c86fd9f5b4c5342' 
  AND token = 'nvI1opxcwRZ8EQl8cnYDF8P9rUecvS2ZcQuew1KNExM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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