Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '271f46b35cfd2e5bf9757eb019493b746460824dd8d09805878e08eecb4ea562' 
  AND token = '2pJ0601fS34cvgrr7ujebKPj6LHAvgLnARrnOwvir+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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