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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '27d86fe7830333c9a55efdf6bc40bb623444707f4ca2fd41dceb1fb5186e9966' 
  AND token = 'x4ZFGHx4XeCIecmoYPNcSWxfxEgyB+iOe9X5KQRIHIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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