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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fe925c76573426bb554a830b654e5379c467ce1213b4363dddbaf60ce57b9f22' 
  AND token = 'hN0nEZ7uj0ZmUAjpiR2DSKDdBt5OXWHnMor512IIok4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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