SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a65b403ef041ca2f100b4c9183949bdd8dc8b725d4528f445773051bb75ce9ca' 
  AND token = 'Bgw/4zWT98KdEdCq8+gp8K+fN1zbQUfWSmaar+ypXgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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