Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0763d73fb71c41df1c015c1e344d90a3b5b6c2fcc15d319c3ef9ddafa3736a3' 
  AND token = 'EhEFhH7rrIe7alZLVNH2F2Tv3PmpI/d36OnSMIQgBZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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