Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fafb86e2ade2e5d91f79801399b322635afc737840288ada22ae76e31e7aa0b' 
  AND token = '6MTB7GVxvtS6DMRkjYIVdKtkojOlDqMh1+x+IiZsS6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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