Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e6d3d815d14a0a83c7ee3a04f777787f40224084734bce0f4e6b4c5e3b654721' 
  AND token = 'Uc7+Ywk5vxdaO46DTMN49tvQBAj255qHd01sqV/C7eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00122

JSON explain

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