Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb94af74fce5bd8da0a04e2251f3a8d85d5a218eecc9c8efac2a3dd24eb2be2' 
  AND token = '9Ujo6JjP+FVqmq0ciVGBILPhgDtdAENsd2A5H2Pc5l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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