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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c7da568529493245bb6c5e5efbc5c6a1bd6b15f757f53b554a8fec7e808d7f8c' 
  AND token = 'y2D8SS2EJeWT0u9nJdoOrZFyJQNHNYb3gHgeBJB7u0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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