Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b9c3f2b0d123733bf6ea8d7ce805df7752a6553ab9ac3550c94ce141fe7635ee' 
  AND token = 'xT1f/0bPiXKMTh/SvxG8JcsynZ6k10tbN/GZkE4djRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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