Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ccf87fc73bb0c4d43c9586a8c366c323219daf93bc9f1e8475fabb0dddf0f64' 
  AND token = 'emt4aaU4AGySdjcQnpICedyMR+6+5yTYncSLHnj6E0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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