Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac735762df8ae221de86e7303d104998352627f31c3aaa03badbd03e99a8afc' 
  AND token = 'RDD4qSsL4gcQlOJFssv/3REDO0ZSFt+r6LhSClbrzm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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