Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b564e6c14718897c80a7c8c89875d4f7842cfad85ac4e1f48e2199f489e2f9d8' 
  AND token = '+Q1xPjFrTo6Q3omx5IRleVIwvJtDbe7Qv7GCa0DUUcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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