SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a4c4624ed626463c35f272381c63a69ad0221c15816c0d07e2159b842918f9e3' 
  AND token = 'XgAHI67F6tfizvTzD0k0iOwqjC0Q5xzxjSHmoKl+Lx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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