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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ea14fd6d42f2ab16e2ee58f1568207b82f9f52b09d01d3d1dff30bda4f89a14e' 
  AND token = 'JIgSL9Keln8oZnXWfRykGmrtTcjpa/sEdgNhuVL2f2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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