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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e9f3f285ca8bdd8118564a36135e9f636ca9feb7fb2b665c9a60d8451e18200d' 
  AND token = 'rDdPY9xhwe0TxVbiUwmo3DCG34diOAcIKAvmbjA7K68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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