Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f6bd69e2adda97d5345da055e62b7e8d73119053c98d4bbbb2506e857ca8139' 
  AND token = 'sKiXr27R3obE/rMl9XVcdIS4BDYEXEHtvcmCTGzNMps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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