SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e9488b614ebdb026f27ca9f37db13bd66fd7c5dd18a4643b19b93d15f77bdde8' 
  AND token = 'URh/1593XjnskuIh/4hkKBQGLNS7o5iOSPVXVVznCG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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