Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0051e1ced917580f68647d938b849bb3f1a72cd07d22382a3c2118a99a235892' 
  AND token = 'NykAP7QqApBrTqPWbZ0u84z3dErgtGS/+lVYrYbLZ3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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