Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8c558ea6fd01a73bcb2c6a3edce68534c47f386b9558da07c3dbe867088f8c9' 
  AND token = 'vqksqy7TFiZN6jSqPMnEf22+kiBp65fyLBhbYE6o1FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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