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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cd934fe7b807d2c5ec87f819b1b4322bc870e2f0bfe376b4e97c8239ee882ae8' 
  AND token = 'VX8L3CCBqDSq1G9aXQn/IiY/v7r80YaFiBVdYKgCPG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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