Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbab1f51bbda2d831677e0baf469969f5c08ed15ce636c104a52e1026b923b7e' 
  AND token = '62w2aiuHvIsmDzDSR76v82FfVwCxsByfPOpPocO4OV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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