Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9dc1890208f5b68d0f0ceff59e78cac1114587bc97306f550df8f945630ac96' 
  AND token = 'RHYmKoqcyK3Dte+8VPNEZKUDXBE7ShoIVt3oNlmtvNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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