SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5cddd447b534bc6d21ee5e321dc1747b192f13cdfb9a02bb8d3a953968ea14cf' 
  AND token = 'bi98N4k8LLh77I1FGYMYMHKKhqNVLJ8mhZZSP5UZCzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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