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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '415a94425447918e093da1293aeee6f4bd5968c4709950b9c7101fc5a8d6df4d' 
  AND token = '5ktgb8e4DmwSJRxDyVj7QRw9Ehk1yKtnWXvOJb+bTro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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