Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '569c6ceb2b3e0083d8450e6fb5d12118ffde35de48f82ff40de940f8e2aa98c9' 
  AND token = 'hmhWG6moWI1oNeXGeHXEjx4bJIFvvrrwZm8EE86TRFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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