Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce796ec7c43af1cd314ea75388115f7860d05451c708fec5a7e1304e3abfd8e1' 
  AND token = 'iEt7s5f99oDTCm8Fj2/gFdcYmH1V4VfWmUKAzPKGtRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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