Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f28cdc037a4ffa191e15a3e901ff2b9f6d9a286538e97a5292e15f4a5995c0c5' 
  AND token = 'Pcjw6GdHTPH+AFR8v8YYvIHOm8yR+x1LliU1L13z3ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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