SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7fe447fde8ffcdf75d97bc62495f24282fcf4b08e001bec74387c497f65928aa' 
  AND token = '0LI+wIvSxlhHBdmgFie0HREM2AtwjrCJuVRNtUMoL/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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