SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd89fc6404edf69fc5f1727644b26627044be8acc0f6a22c21b07898b4614405d' 
  AND token = 'PFZWVZ16PTfjt7ZWs7rjcIKBluYXf6YqxCgfGqVSIzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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