Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f64bc0f24f48bb62245cde79c311c04c8f2a8b864ccb59b5e39836c00a8218d' 
  AND token = 'tDCiRorm0VfD/jXc4FCMzPAccVqBrtsET/iLsuzcKUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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