Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd4643dddbfb70e3ca11472d9c119f173ca55365f5277d6b66117107dfa7a93' 
  AND token = 'JfWcfXqrnH3dRi/95LR0mv7jOxA1XEG3D8s5+/PCEjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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