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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ff5fd9486d302fcea449cd1562033da98c1c1340e80dafd6d6a9f010f6b56c58' 
  AND token = 'ef6YWWZX55poagVwSuATt7V4qB1WaXbHfRLhCMQEhxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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