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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '41e211a9c352e0ee75793533f3d9c5eeb35436a2026ac39753ea111ea60c4a74' 
  AND token = 'VLGO/aMn8cRYt0L2Zbxt4x7DI6Vg642ObvH2p9lNgJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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