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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6eda92d30a9910ed45a7950f756569e8d21366d4810d46fd5ce42ff228e05bc4' 
  AND token = 'eG6D+KgW73qHJ5Mb82LbTYXIkYjHGciUkdM7LTh60Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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