Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daeb46b802f6d7d24aed112197fa812a155361650c515543c4b3a9d0d174a79f' 
  AND token = '62DMIaM7JVcXND/fRxog35YKhMuDzgLA5RaDMAMchxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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