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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '018a819508ddc881a283affe86fda29d0ba6a431901d258149527b377b52fdb6' 
  AND token = 'ZDQnzV36btZI6kZZ5FHjT3MZ5CzWfnIrwRLxZYlZnbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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