Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a674ac55351e2e628640a4c67ee06530d3b50b4a2052684ce7c4e1c5268a290' 
  AND token = 'nhuUF3VroivemErqVrAmA9NgDxGNsqAPE8b+TRufP9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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