SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '56f9e3a579d46a9e27c8f3fba5a659c5f0342c3716c409cf340db797815f8533' 
  AND token = 'qUL5PIjqNVfjvWGC0QVFqi0rRJE/kWSCLaGF3bytKUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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