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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '08b05966f63e838057d38ea8aadfb86c8c9bdc9e00ed81ce6d6f6318954bdfd7' 
  AND token = 'iDfNKPWSjocEKbSZwV+49JFpj2IxbBFvo1KUwTtaKNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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