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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dc5876aec55a48bea1785d23a9c139c9525b712928a6aebfa1ece3c280ffb531' 
  AND token = 'qVj9ZctTig4yXIJFaVOrQ4w0E/yQeqNMtgRi6RkxO1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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