Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '326761a12314fab7e379a72ce7740305b26608f68ac960459f0c76e7247ea649' 
  AND token = 'Ygp0TzcqeSu1nnhykXtfRq2aeORKQVglESO4D3oyf44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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