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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'daaaba90cfd329846e0a7fb4dd05c78321d3df55eaf3d6819b31e33dcb8c746e' 
  AND token = 'lWLuNoK2AQeIHFfwkt6TzqrYMQ7DLZbqC1ri6UbLnb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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