Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff19ec66bf76ff2e596790c365ff4e9cb593f1e7e313883cd25308af633ee64a' 
  AND token = 'i7EpuJuAMYO4dabpjF86EDAwgHQ2GsQ84a/bly0DgZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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