Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd121fa000e147949e0d0414f6e607a53e7ff285f5e5eea97bc455cf4ada78ef9' 
  AND token = 'e5RslDlGvETyX2jSDvxAg+z1bFrSTqyMcLDe5l8K5tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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