Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b138ca698f6bd9beeb6afca1a81912bbe1141d161be1e52b8196a2b08b750fe5' 
  AND token = 'Qrt/Rujgh5sPZz8Ln0kwRxnzLDuMhOhz2oIpdif+nuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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