Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9986d0d2358d3875be91aa7f1e98698b50532a98864214f852b8c415021c1f3' 
  AND token = 'cyEJDYPzbqPCji+rsgzCxquudx44HcaI3HppaHdzM5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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