Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8d886fae1dce3b9d157bdbd09a0b7a2de3301dba71d9ef1301c94c6bf6d1e4' 
  AND token = '/sJCwMdNAkgk5uITgGKecMWOA3oGdbbaUuP82KEdIcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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