Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9081257dc23f7b5686c751c258ff2e3f39fabf5f38a6a5b5f108c85a74e0a7a3' 
  AND token = '4+Ag42pbzgXsAkvsSRS4iH2tH/vfVwRw7OOng6kfMkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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