Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca0dc9e9e8a4f4ec7199a826f8b871bea3350c65e8241dca65fba8c0d76821c3' 
  AND token = 'Op2XfgYhR2ELAaPO1nfGLnjixgCCp17pKAQb9Tp8ZA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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