Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '276b64dbe0f981bc089bc27acaa23dbef2cd2084ac9a9421aecaff4f4441efdd' 
  AND token = 'bkXdpzGPrbGKAZ11R9GbcZeBkwHvnTI2QP+t76JcuOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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