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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '59803fd55bab4346b4faf32a9165e3d232b91f1a07ba720035a5504093570923' 
  AND token = 'VXAEx/uLUsn6TNZANzkoKxoYQkK6xS6kb9wHCVuOIAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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