Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaf51f4a9b87294a15d09873a2bd273a69e5a6d5a1e69d048d0486d235073e0b' 
  AND token = 'OtQNic3dWZpClJ5RucXywHwo4pItT4D3q2kERW+E4YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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