SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6b1888b44ec9ac9af2ee9325864792322d0c2f35c53df0753319e3e4a9818b01' 
  AND token = '0XuJAmGGvD8JxA98HoFRc/KJg5jSFjUjt6Ilf98GqhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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