Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15adbad87cd7a70d8ebeb5f621679c1af51c474ff395e7088b7901647318b0de' 
  AND token = 'sZVOMWk0TpJ81AJZOQphVk9n1kcxZzLyTTZB+MLgqLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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