SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '46082161c885b4a29407b7f82fd682c90f6e907afa9a571254e2351acd934da2' 
  AND token = '2W+XG14sIcINeZP3lJCc+qn12Kl7IoxzJRj5uhhNxoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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