Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6dcfbd544b7f8fca0c29907b0845f1dd058e0fb4fe55045c2735cbd68d6625' 
  AND token = 'DKkSlVyEwHcQoAiDNdLqZvTNv/s0+K0NQ/VzZ10W1bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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